--- /dev/null
+/**
+ * @fileoverview A rule to disallow modifying variables of class declarations
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+ meta: {
+ type: "problem",
+
+ docs: {
+ description: "disallow reassigning class members",
+ category: "ECMAScript 6",
+ recommended: true,
+ url: "https://eslint.org/docs/rules/no-class-assign"
+ },
+
+ schema: [],
+
+ messages: {
+ class: "'{{name}}' is a class."
+ }
+ },
+
+ create(context) {
+
+ /**
+ * Finds and reports references that are non initializer and writable.
+ * @param {Variable} variable A variable to check.
+ * @returns {void}
+ */
+ function checkVariable(variable) {
+ astUtils.getModifyingReferences(variable.references).forEach(reference => {
+ context.report({ node: reference.identifier, messageId: "class", data: { name: reference.identifier.name } });
+
+ });
+ }
+
+ /**
+ * Finds and reports references that are non initializer and writable.
+ * @param {ASTNode} node A ClassDeclaration/ClassExpression node to check.
+ * @returns {void}
+ */
+ function checkForClass(node) {
+ context.getDeclaredVariables(node).forEach(checkVariable);
+ }
+
+ return {
+ ClassDeclaration: checkForClass,
+ ClassExpression: checkForClass
+ };
+
+ }
+};